Metallurgical investigation of metal dusting corrosion in plant-exposed nickel-based alloy 602CA
Authors: Albertsen, J. Z.; Grong, Ø.; Mathiesen, R. H.; Schmid, B.
Source: Corrosion Engineering, Science and Technology, Volume 40, Number 3, September 2005 , pp. 239-243(5)
Publisher: Maney Publishing
Abstract:In the present investigation, metallurgical characterisation of the nickel-based superalloy Nicrofer 602CA has been carried out following field exposure at approximately 540°C for 2 years. In general, the Nicrofer 602CA alloy is found to exhibit a high intrinsic resistance to metal dusting corrosion under the prevailing circumstances. Only a thin zone is affected by carbon intrusion, extending about 20 m from the surface and into the bulk of the material. The subsequent field emission gun scanning electron microscope and synchrotron X-ray diffraction analyses of the exposed Nicrofer 602CA alloy revealed the presence of various phases at the corroded surface, including nepheline (NaAlSiO4) and presumably also corundum (Al2−xCrxO3). None of these oxide phases are commonly observed in connection with metal dusting corrosion. It is believed that the nepheline phase forms as a result of reactions between corundum and the substances Na and SiO(g) transported to the surface by the syngas.
Document Type: Research Article
Publication date: 2005-09-01
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